import React, { Component } from 'react'
import store from '../../redux/store'

export default class Count extends Component {
  // 监听redux状态的变化
  // componentDidMount(){
  //   store.subscribe(()=>{
  //     this.setState({})
  //   })
  // }

	//加法
	increment = ()=>{
		const {value} = this.selectNumber
    store.dispatch({type:"increment",data:+value})
	}
	//减法
	decrement = ()=>{
		const {value} = this.selectNumber
    store.dispatch({type:"decrement",data:+value})
	}
	//奇数再加
	incrementIfOdd = ()=>{
		const {value} = this.selectNumber
		if(store.getState() % 2 !== 0){
			store.dispatch({type:"incrementIfOdd",data:+value})
		}
	}
	//异步加
	incrementAsync = ()=>{
		const {value} = this.selectNumber
		setTimeout(()=>{
			store.dispatch({type:"incrementAsync",data:+value})
		},500)
	}

	render() {
		return (
			<div>
				{/* <h1>当前求和为：{store.getState()}</h1> */}
				<select ref={c => this.selectNumber = c}>
					<option value="1">1</option>
					<option value="2">2</option>
					<option value="3">3</option>
				</select>&nbsp;
				<button onClick={this.increment}>+</button>&nbsp;
				<button onClick={this.decrement}>-</button>&nbsp;
				<button onClick={this.incrementIfOdd}>当前求和为奇数再加</button>&nbsp;
				<button onClick={this.incrementAsync}>异步加</button>&nbsp;
			</div>
		)
	}
}
